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Thermal relay

A thermal relay and installation box technology, applied in the field of thermal relays, can solve the problems of long heat transfer, can only be used as overload protection, thermal relays cannot be short-circuit protection, etc., to shorten the on-off response time, reduce mutual Interfering, increasing sensitivity effects

Active Publication Date: 2020-08-07
ANDELI GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the heat transfer takes a long time during the heating and bending process of the bimetal sheet, therefore, the thermal relay cannot be used as short circuit protection, but only as overload protection

Method used

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specific Embodiment approach

[0027] Specific implementation method: After the load is heated, the metal measuring piece 3 is driven to be heated and deformed. Since the bottom of the metal measuring piece 3 is connected to the fixed connecting plate 15, the metal measuring piece 3 is deformed and drives the fixed connecting plate 15 to slide along the slide rail groove 2 , because the fixed connecting plate 15 is in contact with the conical disc 14, and the conical disc 14 is connected with the telescopic rod 12 at the same time, during the sliding process of the fixed connecting plate 15, the conical disc 14 and the telescopic rod 12 are pushed, and the metal measuring pieces 3 respectively arranged in three groups In between, the heat interference phenomenon of the metal measuring piece 3 is reduced. At the same time, when a group of metal measuring pieces 3 are heated, the metal measuring piece 3 can still push the fixed plate 5 to ensure the working accuracy of the thermal relay. 12 After pushing the f...

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Abstract

The invention discloses a thermal relay, which comprises a mounting box, wherein a plurality of sliding rail grooves are formed in the mounting box, the interior of the sliding rail groove is connected with a metal measuring sheet, the bottom of the metal measuring sheet is connected with a pushing contact member, the end, away from the metal measuring sheet, of the pushing contact member is connected with a fixing plate, one end of the fixed plate is connected with a convex plate, the top of the convex plate is connected with a reset member, a rotating plate is arranged at one end, away fromthe fixing plate, of the convex plate, rotating rods are connected to two ends of the rotating plate, and the rotating rod is connected with the inner wall of the mounting box. According to the invention, the metal measuring sheets are distributed in the three groups of different sliding rail grooves, and the three groups of metal measuring sheets are distributed in different sliding rail grooves,so that mutual interference of the metal measuring sheets under different heating conditions is reduced, and the sensitivity of the thermal relay is improved; and a fulcrum structure is replaced by the rotating plate structure, so that the phenomenon that the fulcrum cannot quickly tilt the curved bar after the curved bar rubs with the fulcrum multiple times is reduced, and the power-on and power-off reaction time is shortened.

Description

technical field [0001] The invention relates to the technical field of relays, specifically thermal relays. Background technique [0002] The function of the thermal relay is: it is mainly used to protect the asynchronous motor from overload. Its working principle is that after the overload current passes through the thermal element, the bimetal sheet is heated and bent to push the action mechanism to drive the contact action, thereby disconnecting the motor control circuit. The development realizes the power-off stop of the motor and plays the role of overload protection. In view of the fact that the heat transfer takes a long time during the heating and bending process of the bimetal sheet, therefore, the thermal relay cannot be used as short-circuit protection, but only as overload protection. [0003] The working principle of the existing relay is as follows figure 1 As shown, three groups of sheet metal bodies 32 are wound with electric wires on the outside. A push pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H61/01H01H61/02
CPCH01H61/01H01H61/02
Inventor 向国庆刘忠陈武奇
Owner ANDELI GRP
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